Metalation <i>vs </i>Nucleophilic Addition in the Reactions of <i>N</i>-Phenethylimides with Organolithium Reagents. Ready Access to Isoquinoline Derivatives <i>via</i> <i>N</i>-Acyliminium Ions and Parham-Type Cyclizations
作者:M. Isabel Collado、Izaskun Manteca、Nuria Sotomayor、María-Jesús Villa、Esther Lete
DOI:10.1021/jo962155o
日期:1997.4.1
Sequential carbophilic addition of organolithium reagents and N-acyliminiumioncyclization of N-phenethylimides 1 affords the substituted isoquinolones 3 in high yields, with the possibility of varying the substituent at the C-1 position of the isoquinoline ring by changing the organolithium reagent. Ready access to the isoquinolinenucleus via Parham-typecyclization of imides 2 is also described
N-Acyliminium ion cyclisation versus rearrangement. The synthesis of 13,13-dimethylberberines and 3,4-dimethylisoquinolin-1-ones
作者:Harry Heaney、Mutasem O Taha
DOI:10.1016/s0040-4039(00)00081-2
日期:2000.3
derivatives gave the related carbinol amides that function as acyliminium ion precursors in the presence of Lewis or protic acids; the fate of the acyliminium ions is determined in part by the nucleophilicity of the β-arylethyl group on nitrogen, the electrophile used to generate the ion, and the precise reaction conditions and led either to cyclisationreactions or methyl migration.